Core Bond Class [Member] Average Annual Total Returns - Core Bond Class |
12 Months Ended | 60 Months Ended | 120 Months Ended |
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2025 |
Dec. 31, 2025 |
|
| Bloomberg U.S. Aggregate Bond Index (reflects no deduction for fees, expenses, or taxes) | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 7.30% | (0.36%) | 2.01% |
| Core Bond Class | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 7.16% | (0.47%) | 2.05% |
| Core Bond Class | After Taxes on Distributions | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 5.32% | (1.82%) | 0.70% |
| Core Bond Class | After Taxes on Distributions and Sales | |||
| Prospectus [Line Items] | |||
| Average Annual Return, Percent | 4.21% | (0.92%) | 1.01% |